2900% is the change from 9 to 270
Calculation steps:
[( 270 - 9 ) ÷ 9] x 100 = 2900%
Formula
Percentage change = [(270 - 9) / 9] x 100
Subtract the new number by the original number
270 - 9 = 261
261 ÷ 9 = 29
29 x 100 = 2900%
Example